Signs that the SUV based model for running car companies is cracking. A study from the University of Michigan Transportation Research Institute estimates that profits from large and midsize SUV's for GM, Ford and Daimler Chrysler dropped 40% or $7 billion from 2001 to the end of 2004. These figures track a steady decline in profits from SUV's, as incentives are used to promote sales of SUV's, lowering the whole profit structure a big notch downwards. In 2001, this study found that the per vehicle profit was about $9500. In 2005 thanks to big discounts the margin on SUV's is about $6300. On midsize SUV's like the Ford Explorer or the Chevy TrailBlazer, margins are down even more to $4100 from $7200. Responding to this study GM looks at it differently, it sees declining sales as the main culprit not the margins. Its thinking goes like this- as long as we can keep sales up we can cover our fixed costs including costs to retirees which make up a big part of the picture And it looks at the variable profits which it finds to be much higher than the numbers put out by the Transportation Research Institute. ...